javascript复制文章加版权声明代码

国内互联网版权意识严重不足，当你辛辛苦苦写了一篇文章， 却被人轻易复制走并且没有加上出处，这时候可以使用javascript来给被复制的文字增加版权声明。

$("body").bind('copy', function (e) {
    if (typeof window.getSelection == "undefined") return; //IE8 or earlier...
    
    var body_element = document.getElementsByTagName('body')[0];
    var selection = window.getSelection();
    
    //if the selection is short let's not annoy our users
    if (("" + selection).length < 30) return;

    //create a div outside of the visible area
    //and fill it with the selected text
    var newdiv = document.createElement('div');
    newdiv.style.position = 'absolute';
    newdiv.style.left = '-99999px';
    body_element.appendChild(newdiv);
    newdiv.appendChild(selection.getRangeAt(0).cloneContents());
    
    //we need a <pre> tag workaround
    //otherwise the text inside "pre" loses all the line breaks!
    if (selection.getRangeAt(0).commonAncestorContainer.nodeName == "PRE") {
        newdiv.innerHTML = "<pre>" + newdiv.innerHTML + "</pre>";
    }
    
    newdiv.innerHTML += "<br /><br />Read more at: <a href='"
    + document.location.href + "'>"
    + document.location.href + "</a> &copy; MySite.com";
            
    selection.selectAllChildren(newdiv);
    window.setTimeout(function () { body_element.removeChild(newdiv); }, 200);
});

代码来源